tty_[un]register_devfs putting 3K structures on the stack

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tty_register_devfs and tty_unregister_devfs both declare "struct tty_struct" locals.

According to gdb:

(gdb) p sizeof(struct tty_struct)
$20 = 3084

This eats up most of a 4K page, and on UML this is causing the stack to flow off the page for some people.

Is it possible to make that tty_struct static or kmalloc it or something?

                                Jeff

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